Rust and scale removing implement



ug. 13, 1935. F METZ RUST AND. SCALE BEM'ovING IMPLEMENT Filed May .22 1933 "25 is not removed. is regulated by reversing valves II and I8 ar- L.

Patented Aug.. l3, 1935 'l l UNITED STATES PATENT OFFICE RUST AND SCALE REMOVING IMPLEMENT Fritz Metz, Merseburg, Germany Application May 22, 1933, Serial No. 672,095 In Germany November 11, 1932 l Claims.- (Cl. 15-22) The rust and -scale removing implements which ing rust and the like by scraping and/ or brushing. -were used heretofore forv the cleaning of iron the implement being provided with a scraper and surfaces and the like are provided either with a a brush, arranged to enable either individual or rotating or with an impact tool. joint application to the working surface and The rotating tools have the disadvantage that means for reciprocating said scraper and brush.

they put a tiring strain on the operator since he From another aspect the invention resides in has to oppose the tendency of the tool to roll back an implement as aforedescribed which is equipped from the surface against which it is applied. with cleaning elements which are easily removed Another disadvantage of the rotating tools is and exchanged.

l0 that the operator or the persons standing nearby In the accompanying drawing' l0 are endangered by particles which fall oi the Figure 1 is a diagrammatic drawing in section work. Moreover, it is difficult to use such impleof the principal Darts Of the rllSl' and Scale removments in Anarrow and confined spaces. ing implement. I

Implements of the impact or hammer-type Fig. 2 is a plan view of the implement. l

have the disadvantage that the working surface, Fig. 3 is a section along the `lines 3--3f Fig.. l. l5 'i which is tobe cleaned. is roughened by such" i v Fig. 4 is a sectional vieil along the lines 4-4 cleaning with the consequence that the resultant of Fig. 1. sharp ridges and edges pierce the subsequently Fig. 5 is a sectional view along the lines 5--5 applied coat of paint or reduce the local thick- 0f Fig. 1-

ness of such coat and thus favor the renewed Fig- 6 lS a 110D View 0f Dari 43 0f Fig. y1. 20 formation of rust. Referring to the drawing, a cylinder I5 is pro- Another disadvantage of these tools is that they vided with a piston I6, the latter being adapted merely peel the layer of rust off the surface, while to be reciprocated in the cylinder by compressed. the rust in the depressions of the corroded part air. The admission and the exhaust of the air An object of the present invention is to provide ranged, respectively, ai the WO ends 0f Said Cyla rust and scale removing implement, which not inder and concentric therewith. Attached to the only removes the rust from the surface, but also piston is a piston rOd i9 Whll eXiendS through from the depressions of the corroded parts, the valve I8 and thence through a combined guide Another object is to provide an implement, the and stuing box 4I for the valve I 8, The outer 30 operation of which does not unduly tire the operend 0f the piston rOd iS DI'OViCled With a Suitable ator. tool holder which supports a. scraper 20 and a Another object is to provide an implement brush 2|l as will be more fully explained here- Which does not endanger the operator or other inafier. persons from flying fragments of rust or other The cylinder l5 iS Provided With an Outer jacket 35 particles. 32 which forms the stock or body of the appli- Another object is to provide an implement; ance. The end of the stock adjacent to the valve which is adapted to be used in narrow and conll iS equipped Will a regulating Valve 22 for the fined spaces and on confined parts of the work. adlniSSiCn 0f the Operating air. The stationary Another object is to provide an implement by part of said valve is screwed into the end of the f which the `dust rising from the Work 1S immedicylinder and is equipped at its extreme end with ately dispersed by the escaping air, a conventional screw nipple. The valve 22 .may

Another objectl is t0 provide an implement be of any conventional rotating type, as indiwhich will start immediately upon the supply of Caied. fOr exampleY in F'ES- 1 and 2 By relating the motive power. the outer ferrule of said valve, the air supplied to 45 Another 1object is to supply an implementv the the nipple may be conducted to or shut ofi' from power and speed of which, may be regulated and the interior of the appliance. l adjusted within wide limits. The valve Il is of the piston type, having in Another object is to provide an implement; its central part an annular groove between tivo which may be used alternately 0r simultaneously shoulders which latter closely fit the bore a 5 as a brush and a scraper. valve scat 33. The vaive seat 33 is'shrnnlrv into Other objects and advantages of the invention the end 0f ille Cylinder i5 adjacent to the screwed will hereinafter appear. part of valve Z2 and is provided with a nurziber The invention in its broader aspect residesin 0f DeSSageS fOr Controlling the flow of air as an implement for cleaning surfaces from adherwill be more fully eXDlainefl Tlie Outer' endet M the ,valve borefis threaded to receive a nut 40 whichlimits the outward stroke of the valve and which holds in place a washer 43 illustratedin detail in Fig. 6. By unscrewing the nut, the washer, as well as the valve body I1, may be readily exchanged for another washer and valve, respectively. The inward stroke of the valve I1 is limited by a shoulder in the bore of the valve seat 33.

An air passage 23 leads from the inner chamber of valve 22 through the washer 43 and the valve body into the bore for the valve I1. A second air passage 24 also -extends through the washer 43 and the valve seat 33 to the bore for the valve I1, terminating therein so'that it is closed when the valve I1 is in its extreme outer position. A passage 25 leads from the valve bore to the opposite end of the Icylinder and the valve I8. Passages 26 and 30 lead from the bore of the valve I1 to several parallel passages 21 which terminate at the end of the cylinder adjacent t the tool holder. A passage 28 leads from the bore of the valve I1 directly into the adjacent end of the cylinder, and a passage 29 leads from the cylinder bore to the bore of the valve I1, asinl dicatedin the drawing.

' The valve I8 consists essentially of two cylinders of different diameters. The outer, smaller cylinder may slide over the inner end of guide 4I. The larger portion of valve I8 is arranged to slide for some distance into a recessed portion at the end of the cylinder I5, while the inside diameter of such portion is of the same diameter as the piston I6 so that upon moving towards the valve I8 the piston slides into the Valve and finally slides the latter towards the end of the cylinder. As the piston moves away from said end, the valve I8 moves with. the former, due to the air pressure, until arrested by abutment against the shoulder of the recess referred to, whereupon the piston may continue to slide while the valve I8 stands still.

Near the end of the cylinder, adjacent to the valve I8, several passages 3| are cut into the cylinder wall, which passages communicate with the passage 21 to conduct the air exhausted from the cylinder to the outside.

The compressed air motor operates as follows:

vLet it be assumed that the valve i1l is in th position shown in dotted lines in Fig. l, while valvey I8 and piston I6 are in the position shown in Fig. l. On turning the-rotary valve 22, compressed air is admitted to the throttle disk 43 and it also impinges upon the area of the valve I1 which projects through the valve nut Ilil.v The pressure on the valve moves it inwardly to the position shown in full lines. As the valve I1 moves inwardly it first uncovers the passage 24 and then the passage 23 and thus air passes first through the passage 24 and later also through passage 23 in the throttle disk 43 and the valve body 33 to the annular groove between the two shoulders of the slide valve i1. From here the air passes through the passage 25 to the slide valve i8. .The pressure of the air against the outer surface of the slide valve pushes it against the piston I and both move inwardly. During such movement the valve I8 leaves the guide fil and closes the exhaust ports 3I and simultaneously admits air directly into the cylinder through an opening between the valve I8 and tl. valve guide di. The valve i8 ultimately comes to a stop against the ysloulder of the annular recess in the end of the cylinder i5 as explained heretofore. The air supplied through the passage 25 now continues pressure of this trapped air acts upon full diame-.

ter of the valve I1 in opposition to the air pressure upon the extension extending into nut 40 and ultimately moves the valve towards the position shown in dotted lines.

With the valve I1 moving towards its extreme outer position, compressed air is caused to pass through the throttle disk 43 and passage 23 into the space enclosed by the piston I6 and the slide valve I1, thus causing reversal of the piston, and, if it is not yet completed, completing the stroke of the valvev I1 to the right. Since the passage 29 is closed by the slide valve I1, the compressed air-supplied to the cylinder to the right of the piston. I6 cannot escape. The air in the cylinder to the left of the piston is exhausted through passages 25, 26 and 21. As the piston I6 approaches its extreme left position, it engages the valve I8 with it and returns the latter again to its extreme outer position, as shown in full lines.

As soon as the piston I6 has travelled to the left beyond the exhaust passages 3|, the pressure f duced pressure of the air in the cylinder I5 and the other being the full supply pressure exerted upon the projection of the valve I1 which passes through the nutJlIl. The latter pressure ultimately predominates and thereby moves the valve I1 towards the leftl This `initiates the next stroke as described heretofore and the motor continues to reciprocate forth and back as long as the valve 22 is open.

If, upon. initial admission of air through the valve 22, the piston I6 should accidentally be in the extreme right position, as shown in dotted lines, while the right hand valve I1 is in its inner extreme position, fresh air ows through the passage 23, the annular recess of the valve I1A and the passage 28 into the space enclosed by the piston I6 and the valve I1. The pressure thus exerted on the valve I1 immediately moves it toward its extreme outer position. As soon as the pasvsage 23 is uncovered by the movement of the valve I1 to the right, supply air passes directly from passage 23 to the space between the piston I8 and the slide valve I1 and forces the piston vtowards the left and the slide valve to the'right. The conduit 29 being closed by theslide valve il, the air thus supplied to the cylinder cannot escape and the piston is moved, as explained heretofore.

The vreciprocatory speed of the device may be varied by varying the bores in the throttle disk e3 'which are in alignment With the passage 23 and 2li, thereby increasing or decreasing the effective air pressure in the cylinder and 'thus the speed of reversal. Furthermore, the. speed of response of the valve il may be varied by varying the ratio between the maximum diameter, which is subm jected to an air pressure tending to move this valve to the right, and the diameter of the projection passing through the mit at, which is suio- Til vse

jected to an air pressure tending to move the valve to the left.' The response of the valve may also be varied by varying its weight. It is thus possible, by exchanging the valve I1 for another valve of different proportions, to vary the speed of operation of the device. This arrangement makes it possible to vary the speed or frequency of reciprocation of the appliance within very wide limit and to adjust it for different operationsand for different supply pressures. To remove the valve I1, it is only necesary'to unscrew the head 22 and the nut 40.

The tool holder which is formed at the outer K end of the piston rod i9 has a forward extension 38. A slot is provided in theextension 38 for receiving the blade 20, the blade being inserted in y the slot from below. A clamp or pin 31 is 'arrange'd to be urged into a corresponding recess Laon one side edge of the scraper blade., The pin 31 is urged into engagement by a spring 36 which is supported on the tool holder by a pin 36a. The blade is preferably made of highv speed steel.

The scraper blade is preferably mounted so as to be approximately at right angle to the working surface and at an acute angle with the direction of the reciprocating motion as seen from above. This mounting prevents scoring of the working surface and facilitates removal of the loosened material away from the blade.

The tool holder is also provided with two lateral flanges 39, one at each side of its center line, which serve for the retaining and fastening of a wire brush 2| which extends laterally behind the scraper 20.

The scraper blade and the brush may be fastened in other ways from those indicated -in the drawing and the tool holder may be suitably modified for such purpose.

. The working surface of the brush preferably forms a surface which is curved in the direction of the reciprocating motion and the working edge of the scraper is preferably arranged to be located approximately on the same curved surface..

' The stock of the tool has a forward extension which carries a vertical roller 34 and two horizontal rollers 35 which engage a rib 42 of the tool holder to prevent it from turning, and which transmit the forces acting thereon upon the stock.

To operate the implementit is gripped by bothl and thus serve to remove the dust loosened there- What I claim as new and desire to secure by Letters Patent is:

1. An implement for cleaning surfaces and adapted for manual support comprising, in combination, an elongated tubular handle, a reciprocatory motor arranged inside of said handle and having a piston arranged to reciprocate substantially the full length of said handle, a piston rod attached to said piston and extending axially outside of one end of said handle and a surface treating implement attached to said piston rod substantially at its outer end and substantially in alignment therewith.

2. An implement for cleaning surfaces and adapted for manual support comprising, in combination, an elongated tubular handle, a reciprocatory air motor arranged inside of said handle and having a piston arranged to reciprocate substantially the full length of said handle, a piston rod attached to said piston and extending axially outside of one end of said handle, a surface treating implement attached to said piston rod substantially at its outer end and substantially in alignment therewith and an exhaust duct for said motor which terminates at said one end of said handle and which is adapted to direct the exhaust air of said motor towards said implement.`

3. An implement for cleaning surfaces and adapted for manual support comprising, in combination, an elongated tubulanhandle, a reciprocatory motor arranged inside of said handle and having a piston arranged to reciprocate substantially the full length' of said handle, a piston rod attached to said piston and extending axially outside of one end of said handle, a surface treatingimplement attached to said piston rod sub-.- stantially at its outer end and substantially in alignment therewith, and means located at the other end of said handle and adapted to conduct 'a supply of energy to lsaid motor, said last men-l tioned means including an operating sleeve coaxial with said handle and adapted to control the supply of said energy to said motor.

4. An implement for cleaning surfaces and adapted for manual support comprising, in cornbination, an elongated tubular handle, a reciprocatory motor arranged inslde of said handle and having a piston arranged to -reciprocate substantially the full length of said handle, a piston rod attached to said piston and extending axially outside of one end of said handle, a surface treating implement attached to said piston rod substantially at its outer end and substantially in alignment therewith, an exhaust duct for said motor whichA terminates at said one end of said handle and which is adapted to direct the exhaust air of said motor towards said implement and means located atthe other end of said handle and adapted to conduct air under pressure to said motor, said last mentioned means including an operating sleeve coaxial with said handle adapted to control the air supplied to said motor.

Fanzmrrrz. 

